Regarding the range transfer of differential pressure transmitters

Differential pressure, which requires offsetting, is mainly used for measuring liquid levels, and generally negative offsetting is needed. For example, the liquid level range is 0-100 kPa. Isolation fluid is required for both positive and negative pressures, and the instrument is installed below the pressure tapping point. Less irrigation on the positive-pressure side, and more irrigation on the negative-pressure side. So the measurement value at this time must be negative. If the value measured at this time is -50 kPa, then your range should be set to -50–50 kPa. If the density of the isolation fluid is known, it can also be calculated based on that density and the height of the liquid level range before installation.

It must be a migration to the instrument side; the range of the host computer should correspond to that of the instrument. As for whether it outputs 4-20, 0-20, or 1-5V, these are just different types of output signals

The adjustment of a differential pressure transmitter, formally known as zero point adjustment, refers to the process of bringing the transmitter’s output back to zero when it is at the zero position intended for measurement. When certain factors cause unequal pressures in the positive and negative chambers of the transmitter (for example, due to the use of isolation fluid in level measurement), the sensor experiences a non-zero pressure difference, resulting in an output that is not 4mA. By adjusting the zero point, the output can be brought back to zero (i.e., to 4mA). This process is known as zero point adjustment. The term \"range migration\" is incorrect; the range of an instrument is simply its range – there is no such thing as migration. What can be done is to adjust or modify the range. Here, it can only be said what the zero drift range of the differential pressure transmitter is. As for the zero drift range of a differential pressure transmitter, it depends first and foremost on the pressure range that the sensor can withstand (specifically, during negative drift the zero point must not be below the lower limit of this pressure range, while during positive drift it must not be above the difference between the upper limit of the sensor’s pressure tolerance and the measurement range).

The measurement range of the instrument itself changes; the 4-20mA value remains unchanged, and it takes on the same range as that of the host computer

The range is the highest pressure value that this tank can generate; for example, a 5-meter water tank can produce up to 50 kPa of pressure, and 50 is the range. Then adjust the value corresponding to 4-20 based on the amount of migration; after making the adjustment, it will be something like -13 to 37. The span remains 50 unchanged

So, during zero-point migration, it still cannot be below the transmitter’s measurement range and the instrument’s scale, right?